CZ2002800A3 - Looper and knife driving mechanism of sewing machine - Google Patents

Abstract

In a cutter drive mechanism (70) for sewing machine, the rotational movement of an upper shaft of the sewing machine is transferred to the upward and downward movement by way of a motion transfer mechanism (71) which is operated in an interlocking manner with the rotational movement and a fabric edge is cut by an upper cutter (72) which is operated corresponding to the upward and downward movement and a lower cutter (73) which is cooperatively operated with the upper cutter. Here, the upper cutter (72) is slidably guided by a cutter drive portion (74) which is pivotally mounted on a frame. The motion transfer mechanism (71) is connected to the upper cutter (72) by way of a clutch (75). The clutch (75) transfers power to the upper cutter (72) at the time of performing the cutters of the cutter drive portion (74) and pivotally moves the cutter drive portion to a shunting position and interrupts the transmission of power to the upper cutter (72) at the time of not performing the cutters.

Description

The present invention relates to a loop and cutter drive mechanism of a sewing machine, and in particular to a loop and cutter drive mechanism of a sewing machine that can perform lockstitch and overlock stitch simultaneously and further can perform such sutures by changing the overlocking stitching operation and an operation in which a lockstitch is performed without cutting off the edge of the fabric.

BACKGROUND OF THE INVENTION

Usually, the knotted stitch is known as the most basic stitch between the stitches performed by the sewing machine when joining several fabrics and the like. In a knotted stitch, when the upper thread that passes through the needle penetrates the fabric as the needle moves vertically, gripping the upper thread with the tip of the hook of the swivel hook in which the lower thread is caught so that the upper thread and the lower thread cross each other to form a knotted stitch wherein several fabrics are firmly joined along the stitch.

On the other hand, as a suture that can prevent fraying of the edge portions of the fabric or the like that is easily frayed, it is known as overcoating. For stitching, depending on the number of stitching yarns and the number of needles that perform substantially vertical movement relative to the fabric surface, single-needle double-needle stitching is known (US Stitch Standard: Stitch type 503), single-needle triple stitching (USA Stitch Standard: Stitch type 504), and double-needle 5-pin overlock (US Stitch standard: Stitch type 516), which combines chaining and overlocking and is commonly called interlock.

However, in such an overwrap to form stitches, the thread is gripped from the side by two hook-shaped needles. called loops or loops, which are caught by the needles when moved horizontally. In this way, since the loop yarns do not cross in a direction perpendicular to the fabric surface with respect to the needle thread, it is not possible to firmly bond the fabrics as in the case of a knotted fabric. there is a so-called grin, which, when the two fabrics are joined by the overlap, open, the sewing threads being exposed to the outside. Therefore, when performing the overlay after joining several fabrics, it is necessary to create a stitch (U.S.A. Stitch standard: Stitch type 517) by performing the bound stitch.

With such a stitch (US Stitch standard: Stitch type 517), however, it is desired that the knotted portion and the overlock portion are arranged as closely as possible to each other, the knotted stitch requiring a swivel hook to grab the lower thread underneath the needle that performs vertical movement. for wrapping there is a need for loops that move across the vertical movement area of the needle and which are arranged separately from the wrapping needle and therefore naturally there is a limitation with respect to the respective positions of the knotted part and the overlock part of the stitch. have been proposed in Japanese Patent Publication 15268/1981, Japanese Patent Publication 25145/1985, Japanese Patent Publication 25396/1986 and the like. However, all the sewing machines described in these publications are sewing machines that may choose to use one of these functions and it is impossible to perform the lockstitch and overlock stitches simultaneously in such a condition that the locked stitches and overlock stitches are arranged as close as possible.

On the other hand, methods in which bound stitches and overlocking can be performed simultaneously have been suggested in Japanese Laid-Open Patent Publication 113490/1980, Japanese Laid-Open Patent Publication 136085/1980, Japanese Laid-Open Patent Publication 146190/1980, Japanese Laid-Open Patent Publication 122495/1988 and the like. . However, in these suggestions as to the overlock stitch, since the loops cross instead of the vertical movement of the needle and are arranged separately from the overlock, the loops movement of the aforementioned conventional overlocks assumes their movement as locked stitch requires rotating hook to grab the lower thread under the needle vertical movement and overlock stitch requires loopers that perform their movement so that the movement crosses the vertical movement region of the needle performed separately from the bound stitch. Therefore, there is naturally a limitation on the position of the overlock stitches and the overlock stitches, and it has been difficult for the sewing machine mechanism to make the overlock stitches and overlock stitches simultaneously when the overlock stitches and overlock stitches are arranged arranged as closely as possible to each other.

In addition, a lock / overlock stitch accessory (manufactured by TOYO SEIKI KOGYO KABUSHIKIGAISHA, named RUBYLOCK) has been proposed that simultaneously performs a lock / overlock stitch (Japanese Patent Publication 2541601). As shown in FIG. 27, this accessory is used in such a form that it is attached to the fabric press bar 1001. The crank arm 1003 is driven by a needle bar (not shown in the drawing) that carries the needle 1011. The crank arm 1003 pivots the upper looper drive plate 1005 mounted on the accessory frame 1002 via the drive linkage 1004. Due to the rocking of the upper looper drive plate 1005, with the upper loop 1007 mounted on the accessory frame 1002 via the upper link drive rod 1006

1006 Looping Rocks. On the other hand, due to rocking of the upper loops drive plate 1005, the pin 1005a. mounted on the upper loop drive plate 1005 in a protruding manner, it slides in and along a groove 1008a formed in the lower loop drive plate 1008 mounted in bearings on the accessory frame 1002, and pivots the lower loop drive plate 1008. Due to this rocking of the lower loop drive plate 1008, the lower loop 1010 housed in the frame 1002 is rocked by the lower loop drive rod 1009. In such an accessory design, since the upper loops 1007 must

T ~ \ + · * 1 V »-Τ» + “—1 Λ T“ «1ti 1 Γ \ 1 Π V» X— \ V · v \ τ 'T x- \ X / -> 4- Ί Ί / · »-» 1 — r r- »x- ~> -v ·» - »χί -» - A χ — κ \ V »X— ·. νν> τ 'yrvcxixcxL. jcnxw -l ±± to iivj.íi ± l.cx \ u c ±± (iiczjiiaziuiiicnu / _z uuxn_i_ looper 1007 is inclined upward toward the left as viewed in the feeding direction of the fabric and in the feed direction. Further, since the lower looper 1010 must intersect the needle 1011 on the lower surface of the fabric, the lower loop 1010 is inclined downward to the left in the feed direction and in the feed direction, the upper and lower loops 1007. 1010 are inclined so that the upper and lower loops 1007, 1010 .

In the drawing, the reference numeral 1014 denotes the sewing portion of the needle 1011. the reference numeral 1012 denotes the thread tensioning device and 1013 denotes the loop of the looped thread driven by the lower loop looper drive plate 1008.

In accessories having such a structure, when the needle bar moves up and down, the lockstitch is formed by a needle thread (not shown in the figure) that passes through the needle 1011 and engages the lower thread (not shown in the drawing) in a rotating hook (not shown in the drawing). At the same time, the crank arm 1003a 1003 is driven by the needle bar and the crank arm 1003b of the upper looper drive plate 1005 via the drive linkage 1004. Due to this rocking of the upper looper drive plate 1005, the upper loop 1007 rocks through the upper drive loom 1006

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4 4 4 4 44 44 4 Loopers. Due to this rocking of the upper loop loom drive plate 1005, the pin 1005a projects in a projecting manner in and along the groove 1008a. formed in the lower loop drive plate 1008 so as to rock the lower plate drive plate 1008. Due to this rocking of the lower loop drive plate 1008, the lower loop 1010 is rocked by the lower loop drive rod 1009 such that an overlock stitch of the upper loop thread and the lower loop thread (not shown in the drawing) is carried out through the upper loop 1007 and the lower loop 101 respectively. .

However, with such accessories, since the top and bottom loops 10 are 0.7. 1010 is inclined, precision machining techniques are needed in production and precision maintaining techniques are also needed. Further, since this type of lockstitch machine is typically used in households or in tailoring, the operation to change the fabric presser and attach the presser to its rod becomes extremely difficult and the operation to adjust the relative position of the upper loop 1007 and the lower one Loop 1010 relative to the needle after attaching the accessory also becomes extremely difficult. This accessory also suffers from the serious drawback that the overfacing operation must be carried out after pre-cutting the edge of the overwrapping fabric using scissors.

Therefore, the inventors of the present application have proposed a single needle quadrilateral knotted / overlock stitch structure and a method for performing such a stitch, comprising both a knotted stitch and overlock stitch function and can form such a structure simultaneously using a sewing machine (Japanese Patent Publication 2672097). Users of lockstitch machines have strongly required research and development of a lockstitch machine that can perform a single needle four-thread lockstitch structure.

• the overlock stitch and the method of performing such a stitch structure described in the above design.

Further, for all single-needle double-needle overlock stitches (U.S.A. Stitch standard: Stitch type 503), single-needle triple-needle overlock stitches (U.S.A. Stitch standard: Stitch type 504), double-needle double-needle overlock stitches (U.S.A. Stitch standard: Stitch type 516) and the like. used for making stitching stitches, performs stitching by cutting off the edge i

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Here, it is believed that the overlock stitch can be easily performed even with the lock stitch, if the zigzag stitch is performed after cutting the edge of the fabric in a zigzag pattern. Based on this consideration, this sewing machine in which a cutter function is added to the lockstitch was proposed in Japanese Laid-Open Utility Model Application 90056/1982, 90057/1982, Japanese Patent Publication 31950/1983 and the like.

Here essentially to the requirement that the lockstitch machine be made in compact form, it is necessary that the bound part and the cutting part with the cutting mechanism be arranged as closely as possible to each other. However, since the lockstitch stitching requires a pivot hook that engages the lower thread under the needle to move up and down, there is naturally a limitation in including the clipper clipping mechanism in the existing construction of the lockstitch machine. Thus, it has usually been difficult to physically realize a lockstitch machine that can perform a lockstitch and trim the fabric edge

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• At the same time and commercialize the lockstitch machine with the sewing machine mechanism.

The present invention has been made to overcome the common drawbacks and it is an object of the present invention to provide a loop mechanism of a sewing machine loop that performs both a lock stitch function and an overlock stitch function and can perform them simultaneously using a single sewing machine.

Another example of a sewing machine trimmer mechanism, which may include a portion of the clipper clipping mechanism into an existing sewing machine design space and may change the operation to perform the overlock stitch by cutting the edge of the fabric and the operation to perform the bound stitch without cutting the edge of the textile.

SUMMARY OF THE INVENTION

To accomplish this, for a sewing machine loop mechanism using an upper thread that passes through a needle that moves up and down with a path vertical to the needle plate and the lower thread is trapped in the swivel hook, the upper thread that passes the reciprocating needle in the vertical direction and passing through the work deposited on the stitch plate at each stitching operation is, at the time of raising the upper thread from the lowest needle position, caught by the hook tip of the rotating hook in rotating movement so that the upper thread and the lower thread intertwine to form a knotted portion of the stitch formed by a stitch parallel to the work surface and a stitch perpendicular to the work surface, and the overwrap portion of the stitch is formed by the upper loop thread and the lower ····························· · ··> · 'looper threads which pass through the upper looper which performs a reciprocating movement along a substantially arcuate path above and below the throat plate and intersects the path of the needle above the throat plate and respectively. a lower loop that extends along a substantially arcuate path beneath the throat plate and intersects the needle path, respectively. The top loop path of the sewing machine loop further comprises a loop part of the loop having a structure in which the top loops and the bottom loop are arranged below the suture plate, respectively. their hook tips are arranged in the same direction so that Kv h vnhw γΊίοτλο no rwoH v-s-? AI AI AI <<<<<Ί Ί Ί Ί Ί Ί Ί Ί Ί Ί Ί ^ ^ ^ ^ ^ ^ ^ aca aca a and c-t_u j_ c κλ 11 -L o j_ ca. in the yarn direction, the upper loop and the lower loop are driven so that the upper loop and the lower loop perform a movement having a path in planes substantially parallel to each other, the upper loop which passes through the upper loop, which reciprocates an arcuate path that intersects the needle path above the throat plate and passes through the throat plate is caught by the needle descending from the uppermost position, a lower loop thread that passes through the lower loop executing reciprocating path, intersecting the needle path with the upper loop path below the throat plate the lower loop is moved from one end position to the other end position of the track and the lower loop is caught by the upper loop rising from the lowest position as the lower loop moves to the other side, the upper loop and the lower loop At the same time, the upper looping thread loops with the knotted portion over the upper work surface and the lower looping thread loops with the knotted portion over the lower work surface to form an overlying portion.

The loop section of the loop includes a crank that is mounted on the loop of the loop, driven by the lower drive shaft, the lower loop drive rod coupled to the crank, the lower mounting arm, and the lower linking arm. Lower Loop Loop Support Loop Mounted in Frame, Upper Loop Upper Loop Support Arm Mounted and Upper Loop Loop Mount Loop Support Loop connecting the lower loop drive rod and the upper loop fastener mounting arm.

The looper drive mechanism of the sewing machine includes a clutch that forms a coupled portion and an overrunning portion by transmitting power from the lower shaft to the looper drive shaft at the time of forming the overflowing portion and forming a coupled portion by moving the upper looper in the lowest position and interrupting power transmission from the lower shaft to the looped drive shaft. at the time the bound part is formed.

In such a loop mechanism of the sewing machine, the upper loop and the lower loop are respectively arranged below the throat plate, their respective hook tips are arranged in the same direction so that the hook tips pass in front of the needle in sewing direction, the upper loop and the lower loop are driven such that the upper loop and the lower loop perform movements having paths in planes substantially parallel to each other, wherein the loop drive mechanism has both a bound stitch function and an overlock stitch function and can be performed simultaneously by a single sewing machine.

Further, the clutch may be rearranged such that the clutch forms a coupled portion and a skirt portion by transferring power from the lower shaft to the looper drive shaft at the time the skirt portion is formed and forming the skirt portion by moving the upper loop in the lowest position and interrupting power transmission from the lower shaft to the looper drive shaft at the time of creating the bound parts.

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Still further, the sewing machine cutter drive mechanism to achieve the above task is a sewing machine cutter drive for cutting the edge of the fabric by an upper cutter that performs up and down movement by a motion transfer mechanism that is controlled by the rotating shaft in a blocking manner and the lower cutter is operated in conjunction with an upper cutter, wherein the sewing machine cutter drive mechanism comprises a cutter drive portion rotatably mounted on the frame and which slidably guides the top cutter and the motion transmission mechanism is coupled to the top cutter so that via a clutch allowing power transmission to the top cutter when the shearing operation of the trimmer drive portion is performed and interrupts the transfer of power to the upper shears to the moved not working.

the trimmer by rotating the driving portion of the position while the trimmer

The motion transmission mechanism comprises a first four-click mechanism that connects the upper shaft formed by the rotating shaft to the frame and a second four-click mechanism that uses one linkage of the first four-click mechanism and the link joint of the frame and takes over the clutch drive part as another one.

The coupling comprises a pin which is formed on the other rod as a drive part and a longitudinal groove formed in the upper cutter so that the pin can be inserted therein as a drive part.

The lower trimmer is slidably mounted on the trimmer drive portion and the lower trimmer includes a positioning locking portion that positions the trimmer drive portion in the positioning recessed portion in the throat plate relative to the needle stitching position when the trimmer is operating.

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The positioning recessed part of the needle plate is adjustable in the right and left directions so that the stitch width can be varied with respect to the needle stitching position.

The lower cutter is slidably mounted on the drive portion of the cutter, and the cutter drive mechanism of the sewing machine further comprises a shear-side compression spring member that biases the upper cutter to the lower cutter.

The lower cutter is slidably mounted on the drive portion of the cutter, and the sewing machine cutter drive mechanism further includes a positioning resilient member that biases the positioning locking portion to the recessed portion of the throat plate at the time of the shearing operation.

The lower cutter is slidably mounted on the drive portion of the cutter, and the sewing machine cutter drive mechanism further includes a positioning eccentric cam that mates with the positioning locking portion into the positioning recessed portion of the throat plate at the time of the shearing operation.

The top cutter is detachably mounted on the drive portion of the cutter.

In a drive mechanism having such a construction, the rotary movement of the sewing machine rotary shaft is transmitted to the up and down movement by a motion transmission mechanism that is controlled by the rotary shaft interlocking method and the fabric edge is cut off by the top cutter and bottom cutter that cooperates with the top as a result of this up and down movement. Here, the upper cutter is slidably guided by the drive part of the cutter rotatably mounted on the frame. The motion transmission mechanism is connected to the upper cutter via a clutch. The clutch transmits power to the upper cutter when the shear operation of the trimmer drive portion is performed and interrupts the transfer of power to the upper shearer by rotating the trimmer drive portion to a shifted position when the trimmer operation of the trimmer drive portion is not performed.

Further, the lower cutter of the sewing machine cutter drive mechanism of the present invention is slidably mounted on the drive portion of the cutter and includes a positioning locking portion that positions the cutter drive portion in the positioning recessed portion of the stitch plate relative to the needle stitching position during the operation of the cutters. a positioning lever that aligns the positioning locking portion to the positioning recessed portion of the throat plate at the time of the shearing operation.

In a sewing machine cutter drive mechanism having such a structure, the rotary movement of the sewing machine rotary shaft is converted to up and down movement by a motion transmission mechanism that is controlled by the rotary shaft lock and the fabric is cut by the top cutter and the bottom cutter that cooperates with top cutter due to up and down movement. Here, the upper cutter is slidably guided by the cutter drive part rotatably mounted on the frame. The motion transmission mechanism is connected to the upper cutter via a clutch.

The clutch transmits power to the top cutter when shearing off the drive part of the shredder and interrupts the power transmission to the top shredder by rotating the shredder drive part to the offset position when the shearing operation of the shredder drive part is not performed. Here, using the trimmer driving positioning lever, when the lowering positioning locking portion of the trimmer slides out of the positioning recessed portion of the throat plate, the trimmer drive mechanism can be directly rotated to an offset position .

Overview of the drawings

An exemplary embodiment of a sewing machine loop and cutter machine according to the present invention is shown in the accompanying drawings, wherein Fig. 1 is an overall perspective view of one embodiment of a lock / overlock stitch machine using the sewing machine loop machine according to the present invention. Fig. 2 (a) and Fig. 2 (b) are explanatory views simply illustrating the operation of a lockstitch / overlock stitch machine in which the loop mechanism of the sewing machine according to the present invention is used; Fig. 3 is an exploded perspective view showing a device for changing stitch, needle stitch control portion and clutch actuator engagement portion of the sewing machine of the present invention, FIG. 4 is an explanatory view showing the needle stitch actuation portion and the sewing actuator engagement portion Fig. 5 is a block diagram illustrating a lock / overlock stitch sewing machine drive system employing the loop machine of the sewing machine of the present invention; Fig. 6 is an exploded perspective view showing the clutch control portion and the drive portion Figure 7 is a plan view showing the drive portion of the loop mechanism of the sewing machine loop of the sewing machine according to the present invention; Fig. 8 is an explanatory view showing an active state. Fig. 8 is an explanatory view showing an active state. a loop portion of the loop machine of the loop machine of the sewing machine according to the present invention, wherein Fig. 8 (a) is a view showing the point where the needle retains Fig. 8 (b) is a view showing the point where the needle engages the lower loop thread; Fig. 9 is an explanatory view showing the operative state of the clutch in the loop mechanism of the sewing machine of the present invention, wherein Fig. 9 (a) Fig. 9 (b) is a view showing the state in which energy is transferred from the lower shaft to the looper drive shaft; Fig. 10 is a perspective view showing The movement transmission mechanism and the trimmer drive portion of the sewing machine shredder drive mechanism of the present invention, Figs. 11 (a) and 11 (b) are explanatory views showing the operative state of the motion transfer mechanism of the sewing machine shredder drive mechanism of the present invention. of the invention, FIG. 12 is an explanatory view; Fig. 13 is an exploded perspective view showing the movement mechanism and the cutter drive portion of the sewing machine cutter drive of the present invention; Fig. 14 is a perspective view of the power transmission mechanism of the sewing machine cutter drive of the present invention; Fig. 15 is a perspective view illustrating the standstill of the cutter in the cutter drive mechanism of the sewing machine according to the present invention;

Fig. 16 is a rear perspective view of the sewing machine, wherein the cutter drive portion is shown in the cutter drive mechanism of the sewing machine of the present invention in another embodiment; Figs. 17 (a) and 17 (b) are views showing stitches produced by the sewing machine. for a knotted / overlock stitch in which the loop mechanism of the sewing machine of the present invention is used, wherein Fig. 17 (a) is an explanatory view of the stitch where the overlock portion intersects the bound portion of each knot; Fig. 17 (b) is an explanatory view on the stitch where the overlapping part intersects

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J. (1) is an explanatory view showing a stitch where the bound portion of the stitch is formed in a zigzag shape of each stitch or is formed in the form of a polygonal line of each double stitch; Fig. 18 is a perspective view showing an embodiment of a 19 (a) and (19 (b) are explanatory views simply illustrating the operation of a lockstitch sewing machine in which the cutter drive mechanism of the present invention is used, FIG. 20 (a) and 20 (b) are explanatory views simply illustrating the operation of a lockstitch sewing machine employing a sewing machine cutter drive mechanism of the present invention; FIG. 21 is a perspective view showing an embodiment of a lockstitch sewing machine in which drive mechanism o FIG. 22 is an exploded view showing the motion transmission mechanism and the cutter drive part in the sewing machine shredder drive mechanism of the present invention; FIG. 23 is an exploded view showing the shredder drive part in the sewing machine shredder drive mechanism; according to the present • · · ···

Fig. 24 is an explanatory view showing the operation of the cutter drive part in the cutter drive mechanism of the present invention. Fig. 24 is a perspective view showing the operating state of the cutter in the cutter drive mechanism of the sewing machine according to the present invention. of the present invention, Fig. 26 is a perspective view showing the standstill of the cutter in the cutter drive mechanism of the sewing machine of the present invention.

peibjjekt 1 Vili lockstitch / overlock stitch accessories that are stored on and used on the lockstitch machine.

DETAILED DESCRIPTION OF THE INVENTION

Preferred embodiments in which the loop and cutter drive mechanism of the sewing machine of the present invention are used in a lockstitch / overlock stitch machine are described with reference to the drawings.

As shown in Fig. 1, the lockstitch / overlock stitching machine includes a lockstitch making mechanism 100 that forms a locked stitch portion comprising a stitch parallel to the work surface and a stitch perpendicular to the work surface and a loop mechanism 50 forming the overlock part of the stitch on the work surface.

Because this lockstitch making mechanism 100 has a known (well known) construction as described in Japanese Laid-Open Patent Publication 117148/1974, Japanese Laid-Open Patent Publication 154448/1977, Japanese Laid-Open Patent Publication 108547/1978, Japanese Laid-Open Patent Publication 60052/1979 , Japanese Laid-Off Patent Publication 110049/1979, ·· Japanese Laid-Off Patent Laid-Off Patent Publication Patent Publication 35676/1980, Japanese Publication 113490/1980, Japanese Laid-Off

146190/1980, Japanese Laid-Open Patent Publication 3091/1981 and the like, the detailed explanation of the bound stitching mechanism is not explained. However, to simply form the bound stitch, as shown in Fig. 2, the bound stitch forming mechanism 100 comprises a needle 10 attached to the needle bar 11 and moving up and down as it travels along the path L10 in the vertical biodegradable position. d uLuuny iiduejs. zu, ΡΛ, νι, γ piuvdui horizontal rotary movement along the path L20 in the same cycle with the upward and downward movement of the needle 10. Now, the upper thread 1 passing through the needle 10 capable of reciprocating in the vertical direction and passing through the work stored on the needle plate 8. each stitch shift of the work, at the time of raising the upper thread 1 from the lowest position of the needle 10, is caught by the tip of the hook 20. in which the lower thread 2 is captured under the suture plate 8 so as to engage the upper thread 1 and the lower thread 2 to form a knotted portion 6 formed from a stitch parallel to the work surface and a stitch perpendicular to the work surface. The needle bar 11 moves up and down through a needle bar drive portion MT1 having a needle bar handle that forms a movement transmission mechanism vertically displaceably mounted on the needle frame 12 having its upper end portion rotatably mounted on the FR frame. Furthermore, the rotating hook 20 can perform not only a full rotation but also a half revolution. I.e. it is sufficient that the path L20 of the rotating hook 20 is long enough to intersect the path L10 of the needle 10 so that the upper thread 1 can be caught by the hook tip 21.

Further, as shown in Fig. 1, in a lockstitch / overlock stitch machine, as soon as the sewing person rotates the stitch changer NB knob to adjust the DL dial of the stitch pattern changer to another type of stitch corresponding to the rotational position of the NB changer knob. stitch, linear stitches, zigzag stitches and the like can be made. The lockstitching mechanism 100 corresponding to these types of stitches has a known (well known) construction, which is described in Japanese Laid-Open Patent Publication 50853/1973, Japanese Laid-Open Patent Publication 32754/1974, Japanese Laid-Open Patent Publication 73754/1975, Japanese Laid-Open Patent Publication 4646/1979, Japanese Laid-Off Patent Publication 6643/1979, Japanese Laid-Off Patent Publication 120057/1979 Japanese Laid-Off Patent

16676/1980, Japanese landed utility model 216/1980 landed utility model 4787/1980, Japanese landed utility model 8406/1980 and the like. E.g. the lockstitch forming mechanism 100 has a stitch patterning device (not shown) or a stitch changing device 100 that produces zigzag stitches or pattern stitches in cooperation with the fabric feed, by moving the needle 10 in a direction perpendicular to the fabric feed direction each time the fabric is fed. up and down. In the lockstitch / overlock stitching machine shown in FIG. 1, the stitch pattern device and the stitch change device 100 are integrally formed as a unit, the stitch pattern device being included in the rear of the stitch change device 110.

As shown in FIGS. 3 and 4, the stitch changing device 110 includes a stitch changer shaft 11 that rotates by manipulating the stitch changer knob and adjusts the stitch pattern and the DL dial of the stitch pattern changer mounted on the handling end side of the shaft. 111 and the various stitches are displayed. The stitch changing device 110 is further provided with a mechanism by which the sewing person optionally selects stitches by manipulating the NB stitch changer knob, selecting the necessary cam from i.

4 ··· ·· ·· different cams of the stitch patterning device and adjust the needle swing and needle feed size.

Further, the stitch pattern forming apparatus and the stitch changing apparatus 10 control the driving of the bound stitch forming mechanism 100 by the needle piercing control portion 520. The needle stitch control portion 520 includes a needle bar pull rod 525 having its one end connected to the stitch pattern device and its other end connected by a 3 & 1 &quot; MT &apos; MT1 η oblique bwno γπ ^ ζ-, Ιο- ^ ύ -ι-Ϊγ ^ τύί · ·ΠΠ. ... »_Z v- _1_ x x -i _t_ J J_XX_I_ v— 11W.A1 _l_ 4J UIU4. Λ. \ J \ J J.

bound needle stitch and reciprocally moves the needle bar 11 to the right and left in the needle frame 12 of the needle bar drive portion MT1 due to the drive transmitted from the stitch pattern device, the needle needle transfer cam 527 attached to the shaft 11 of the stitch change device 110 a needle punch that engages the needle punch transfer cam 527 and is rotatably mounted on the FR frame using a bolt 537 and the needle punch transfer pawl 522 coupled to the needle punch transfer arm 536 via the needle punch transfer rod 539 and engaging the pull rod 52 .

The pull rod 526 of the needle bar is provided with a protruding spring engaging pin 526c, and the tension spring 529 extends between the spring engaging pin and the frame FR. Therefore, the needle bar pull rod 526 is always biased to the left in the front view of the sewing machine. Further, the pull rod 526 of the needle bar is provided with a transfer pin 526d. which engages the needle needle transfer pawl 522 in a projecting manner. The needle punch transfer latch 522 that engages the needle punch transfer pin 626d is secured to the needle punch adjusting plate 521 by bolt 525. The needle punch adjusting plate 521 is pivotally connected to one end of the needle punch transfer rod 539 by the screw 523. the needle puncture and needle puncture transmission pawl 522, which are secured by the bolt 525, are rotatably mounted on the FR frame by the bolt 524 in an integral state. The other end of the needle needle transfer rod 539 is rotatably connected by bolt 540 to the center arm 536c. formed on the needle needle transfer arm 536 protruding toward the needle needle transfer rod 539 near the aperture 536e. through which the stepped screw 537 can be passed. Furthermore, the locking pin 536b is formed by ττ-l -1 <z-, -ί ”™ ρ, ν-, ι '·, V. <- 4 -v X -v- 7 - . Γ7 f ~ -.

utilizing the needle-punching upper portion of the needle pusher arm 536, the securement 536b engages the needle pusher cam 527. Now, the recessed portion 527a is formed in the needle needle transfer arm 527 so that the locking pin 536b of the needle needle transfer arm 536 can be inserted therein. Further, the tension spring 538 extends between the underside of the arm 536d and the frame FR. Due to this design, when looking at the sewing machine from the front, the needle needle transfer arm 536 is resiliently biased clockwise around the stepped screw 537 as the center so that the lock pin 536b of the transfer arm 536 can be inserted into the recessed portion 527a of the needle transfer cam 527. injection in a protruding manner. The needle plate of the needle needle transfer arm 536 is provided with a receiving portion 532a. which is pressed against the distal end of the knob BT of the overlock stitch changer at one end thereof and is provided with a retaining portion 532b for receiving an end portion of the upper side arm 536a of the needle punch transfer arm 536. The needle needle transfer arm retaining plate 532 is rotatably mounted on the needle by a stepped bolt 533. while the needle needle transfer arm retaining base 530 6 is secured to the FR frame by the screw 531. Further, to flexibly bias the needle needle transfer arm retaining plate 536 in the needle needle. clockwise as seen from above, the spring engaging portion 532c is formed on the needle transfer needle retaining plate 532, the spring engaging portion 530a is formed on the needle transfer needle retaining base 530, and the tension spring 540 extends between the a spring engaging portion 532c and a spring engaging portion 530a. Due to such a construction, the retaining portion 532b of the needle plate of the needle punch transfer arm 536 is pressed into contact with the end portion of the needle punch arm upper arm 536a. Furthermore, a retaining base 530 transfer arm 536 of the needle stitching is z3páskou 532H) _of which limits the feed rate during manipulation of the knob BT converter overlock stehu.Následkem this construction, when the manipulation knob presses the BT inverter over-edge stitching, although the holding plate 532 of the transfer the needle needle arm 536 rotates about the stepped screw 533 as a center counterclockwise view from above, rotation is limited by the stop 530b of the retaining base 530 of the needle needle transfer arm 536, and therefore the displacement amount can be reached while handling the overlock stitch knob BT.

A method of forming a bound stitch by the bound stitch forming mechanism 100 having such a structure is explained in connection with Figs. 1 and 5.

The needle 10 moves up and down by transmitting power from a rotating shaft rotatably mounted on the FR frame of the lockstitch / overlock stitch machine, i.e. the upper shaft S1 via the needle bar drive portion NT1. Further, the upper shaft S1 moves up and down the needle thread catcher 730 that pulls or feeds the needle thread through the motion transfer mechanism 71 (FIG. 10). This upper shaft SI is rotatably driven by the energy transmitted to the HP handwheel from the motor M «» v v φ * * *

φ by drive belt ΤΒ1. Furthermore, the needle frame 12. in which the needle bar 11 to which the needle 10 is attached is displaceably moved to the left and right needle positions by the needle bar pull rod 526, which is driven by the stitch pattern generating device. In the needle plate 8, a needle piercing hole PS is formed in a longitudinal shape to the side such that the needle piercing hole PS allows the needle 10 to be moved to the left and right positions.

The rotating hook 20 rotates with the energy transmitted from the rotating shaft rotatably mounted on the frame R of the lockstitch machine. of the lower shaft S2 by means of a rotary hook drive worm gear MT2 which forms a motion transmission mechanism. The rotary hook drive gear MT2 is configured to transmit rotational movement from the lower shaft S2 to the rotary hook 20 by rotating through 90 ° in the feed direction while the driven side gear 202 is attached to the rotary hook 20 and the drive side gear 201 (FIG. 6) is fastened to the lower shaft S2 by fitting. The lower shaft S2 is rotatably driven synchronously with the upper shaft S1 by means of a drive belt TB2 at a rotational speed twice that of the upper shaft (1: 2). The timing of this rotatable hook 20 is set so that the rotatable hook 20 rotates twice in a single up and down movement of the needle 10, and the tip 21 of the hook of the rotatable hook 20 engages the loop of the upper thread 1 when the needle 10 is raised.

The feed rate of the fabric feeder FB is also controlled by the stitch pattern making device. The feed movement of the fabric of the feeder FB constitutes one step of feeding the fabric, the drive portion 120 having a triangular cam driven by the lower shaft S2. lifts the FB to push the work up and moves the FB to the front while keeping it raised

Stav «φ ·>> stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stav stavφ stav 8. and pulls the feeder FB back to its original position.

Further, as shown in Figures 1 and 2, the lockstitch / overlock stitch machine is provided with a looped drive mechanism 50 that forms the stitch overlock portion 7 of the upper loop thread 3 and the lower loop thread 4 that extend through the upper loop 30 a reciprocating movement over the substantially arcuate path L30 passing above and below the suture plate 8 and intersects the needle path 10 of the needle 10 above the suture plate 8 and the lower loop 42 which extends over the substantially arched path L40 0 above the suture plate 2 and intersects the path L10 needles 10 and 10, respectively. track L30 of the upper loop 30.

The loop drive mechanism 50 is provided with a loop drive portion 60 (FIGS. 6 and 7) having the following construction. I.e. the upper loop 30 and the lower loop 40 are respectively arranged above and below the suture plate 2. The respective hook loops 31, 41 of the upper loop 30 and the lower loop 40 are arranged in such a direction that the hook loops 31, 41 pass through the needle 10 as viewed. Sewing direction. The upper loop 30 and the lower loop 40 are driven so that the upper loop 30 and the lower loop 40 perform movements having paths L30. L4 0 in planes substantially parallel to each other. The upper loop thread 3 extends through the upper loop 30, which reciprocates along an arcuate path L30. which intersects the path L10 of the needle 10 above the suture plate 2 and passes through the suture plate 2, being caught by the needle 10 descending from the uppermost position as the upper loop 30 descends from the uppermost position.

• · · · φ ···· φ φ

φ φ φ φ φφ · φ φ · φ φ

The lower looping thread 4, which passes through the lower loop 40, which reciprocates along the path L40 that intersects the path L10 of the needle 10 and the path L30 of the upper loop 30 below the suture plate 8. is caught by the downward needle 10 below the suture plate 8 the loop 40 moves from one end to the other end of the track 40. The lower loop 4 is caught by the upper loop 30 rising from the lowest position as the lower loop moves to the other end. As a result of this construction, the upper loop yarn 3 and the lower loop yarn 4 lock together on the edge portion 5c of the work 5 and at the same time the upper loop thread 3 loops with the stitched portion 5 of the stitch over the bottom surface 5b of the work 5 so that .

The loop drive portion 60 is disposed below the suture plate 8 and, as shown in FIGS. 6 and 7, includes a crank 61b. which is mounted at one end of the looper drive shaft 61 to which rotational movement from the lower shaft S2 is transmitted via a clutch 500 and is driven by the lower shaft S2. a lower loop drive rod 62 coupled to the crank 61b, a lower loop 40 fastening arm 63 coupled to the lower loop 40 driving rod 62 and supporting the lower loops 40, the upper loop 30 retaining arm 64 mounted in the FR frame and supporting the upper loop 30 at one end thereof, and the upper loop loom drive rod 65 connecting the lower loop loom drive rod 62 and the upper loop loom mounting arm 64. This handle 61c and the like. are included in the base 6 01 of the loop mounted on the FR frame. In particular, the loop drive shaft 61 is attached to the loop base 601 and the crank pin 61c of the crank 61b is pivotally connected to one end of the lower loop drive rod. The lower loop drive rod 62 has its other end pivotally connected to one end of the lower loop fastening arm and the other end of the lower loop fastening arm 63 is rotatably mounted on the loop base 601. Further, the other end of the upper loop fastening arm 64 is rotatably mounted on a shaft 602 of the upper loop fastening arm 64 mounted on the loop base 601.

The weaving operation performed by the looper drive portion 60 is explained in conjunction with FIGS. 5, 6, 7 and 8.

When the lower shaft 82 rotates, the loop drive shaft 61 performs rotational movement via the clutch 500 and the lower loop drive rod 62 coupled to the loop 61b of the loop shaft 61 transmits or converts this rotational movement to a right and left reciprocating motion. When the lower loop drive rod 62 performs a reciprocating movement to the left and right, the lower loop fastening arm 63 swings about the pivot point of the lower loop fastening arm 63 to the loop base 601, and therefore the lower loop 4Ό carried by the lower loop fastening arm 63 the path below the needle plate 8 between the right and left sides of the needle 10 as seen from the front of the sewing machine (FIG. 2 (a)). Further, when the lower loop drive rod 62 performs a reciprocating movement to the left and right, due to the upper loop drive rod 65 that connects the lower loop drive rod 62 and the upper loop fastening arm 64, the upper loop loop fastening arm 64 transmits the reverse, right and left reciprocating movement. moving up and down around the upper loop loom mounting shaft 602 as the center. When the upper loop fastening arm 64 performs a reciprocating movement up and down around the upper loop fastening arm shaft 602, the upper loop 30 swings along an arcuate path between a position on the right side of the needle 10 and below the tip of the lower loop gripper 40 and the left-hand position. and above the needle plate 8 in a front view of the sewing machine (FIG. 2 (a)).

• · ··

In a clutch 500 that transfers power from the lower shaft S2 to the loop portion 60 of the loop or interrupts the transfer of energy at the time of forming the stitching portion 7 of the stitch, the energy is transmitted from the lower shaft S2 to the loop shaft S1 to form the bound portion 6 the stitching portion 7 of the stitching, and at the time of forming the bound portion of the stitch £, the upper loop 30 is moved in the lowest position and the power transmission from the lower shaft S2 to the loop shaft S1 is interrupted to form the bound portion 6 of the stitch (FIG. b)). Now, the looper drive portion 60 includes a looper drive worm wheel MT3, which forms a motion transmission mechanism (FIG. 1). As shown in FIG. 6, this looped drive worm gear MT3 serves to transmit the rotational movement from the lower shaft S2 to the looper drive portion 60 after changing the rotational direction by 90 ° in the feed direction, the driven side gear 509 being attached to the second the end of the loop drive shaft 61, which is rotatably mounted on the loop base 601, while the drive side gear 505 is slidably mounted on the lower shaft S2.

Further, the clutch 500 comprises a looped drive worm gear 503 that is fixed to the frame by a screw 504 and fits into the recessed portion 505b. formed at one end of the drive side gear 505, the clutch engagement member 506 attached to one end of the lower shaft S2 and is provided with a recessed clutch engagement portion 506a into which the clutch latch 505c formed at the other end of the drive side gear 505 its end faces, the clutch spring 508 is loosely mounted on the lower shaft S2 between the drive side gearwheel gear side gear MT3 of the rotating hook drive gear 201 and the loop side drive worm gear gear MT3 of the looper and biases the drive side gear 505 so that the latch 505a of the drive side clutch 505c engages the recessed portion 506a engaging the clutch engagement clutch 506 and the adjusting clutch 506a.

99 ► I ϋ spoj clutch rod 501, which is slidably mounted on the FR frame and the looper drive worm gear retainer attached to the FR frame by a stepped bolt and is provided with a distal L-shaped end portion 501a received in a movable groove 505a formed in the gear 505 of the drive side of the looper drive worm gear MT3 at one end thereof.

As shown in Figures 3 and 4, the clutch adjusting rod 501 is coupled to the clutch actuating portion 510 which is actuated by the needle puncture actuating portion 520.

The clutch actuator portion 510 includes a clutch actuator rod 511 that connects the other end of the clutch actuator adjuster rod 501 and the end portion of the lower arm 536d of the needle punch transfer arm 536 formed at the needle punch control portion 520. The actuator rod 511 of the clutch 500 is provided with an elongate hole 511a at its end portion. which is connected to the end portion of the lower arm 536d of the needle needle transfer arm 536 and is slideably connecting the clutch control rod 511 to the needle needle transfer arm 536 by a stepped bolt 514. Further, the connection opening 511b is formed in the other end of the clutch control rod 511. with the other end of the clutch adjusting rod 501. the adjusting longitudinal bore 501b is formed at the other end of the clutch adjusting rod 501, the clutch block 512 is freely received in the clutch opening 511b of the clutch control rod 511 and the clutch adjusting rod 501 is secured to the clutch block 512 so that the position of the clutch adjusting rod 501 can be adjusted by the bolt 513 and the washer 515 and the longitudinal bore 501b. Further, the tension spring 517 extends between a spring engaging bore 511c formed in the clutch control rod 511 and a spring engaging bore formed in the lower arm 536d of the needle needle transfer arm 536. As a result of this construction, the clutch control rod 511 is always flexibly biased in the ve direction

99

999 · 9

99

9 9 9 9 9

99 99 999 9 wherein the clutch control arm 511 is pulled toward the needle needle transfer arm 536.

In the clutch 500 and the clutch control portion 510 having the above construction, in the overlock stitch, because the needle needle transfer arm 536 rotates clockwise by the biasing force of the tension spring 538 in front view of the sewing machine, the clutch control rod 511 connected to the end the needle arm transfer arm 536d moves to the left and therefore the clutch adjusting rod 501 connected to the clutch control rod 511 also moves to the left. As the clutch adjuster rod 501 moves to the left, the distal L-shaped end portion 501a of the clutch adjuster rod 501, which is accommodated in the moving drive groove 505a of the drive side of the drive worm gear MT3 of the loop, moves the drive side gear 505 to the left so that the drive side gear recessed portion 505b 505 slides out of the loop drive bolt stop 503 and at the same time the drive side gear pawl 505c engages with the coupling seat recessed portion 506a of the clutch gripper 506 attached to the lower shaft S2 (FIG. 9 (a)) ). In this way, because the rotational movement of the lower shaft S2 is transmitted to the driven side gear 509 via the drive side gear 505, the upper loop 30 and the lower loop 40 of the loop portion 60 are driven.

Further, when completing the overlock stitch, rotating the needle needle transfer arm 536 counterclockwise as viewed from the front of the sewing machine against the biasing force of the tension spring 538. The clutch control rod 511 connected to the end portion of the lower arm needle transfer arm 536d moves to the right and therefore, the clutch adjusting rod 501 associated with the 9 &apos;, 9 &apos; &apos; &apos; &apos; &apos; &apos; &apos; &apos; &apos; &apos; The clutch control rod 511 also moves to the right. As the clutch adjuster rod 501 moves to the right, the distal L-shaped end portion 501a of the clutch adjuster rod 501, disposed in the moving side drive gear gear groove 505a of the looper drive gear MT3 moves the drive side gear 505 to the right so that the drive side gear recess 505b could engage the drive worm gear stop 503 against the biasing force of the compression spring 508, and at the same time, the clutch engagement portion 506a of the clutch engagement bracket attached to the lower shaft S2 slides out of the clutch latch 505c drive side (Fig. 9 (b)). In this way, because the rotational movement of the lower shaft S2 is not transmitted to the drive side gear 509, the driven gear 502 does not rotate and therefore the operation of the upper loop 30 and the lower loop 40 of the loop portion 60 of the loop is stopped.

The lockstitch / overlock stitch machine provided with such a looper drive mechanism 50 may further be provided with a cutter drive mechanism 70 that cuts the fabric edge 5c of the fabric 5 (FIG. 2) by an upper cutter 72 that moves up and down via the transfer mechanism 71 movement (Figs. 10, 11), which is controlled by the locked / overlocked sewing machine rotary shaft of the sewing machine, i. with S1 upper shaft and lower cutter 73. which cooperates with the top cutter 72.

This cutter drive mechanism 70 is provided with a cutter drive portion 74 (FIGS. 1, 10) which slidingly guides the top cutter 72 rotatably mounted on the frame FR.

»9 9

9999 upper energy

As shown, the transmission moves formed by four handles

Ht 4 · 99 9999 e

9 999 »99

9 9 9 9 9 9

99 9 9 9 9 9 »

The motion transfer mechanism 71 is coupled to the cutter 22 by means of a clutch 75 (FIG. 10) which transmits to the top cutter 72 during the operation of the cutter the cutter drive portion 24. and rotates the cutter drive mechanism 74 to the moved position and interrupts power transmission to the top a cutter 72 at a time when the cutters of the cutter drive portion 74 are not in operation.

1, 10, 11 and 12, the mechanism 71 for the first four-grain grain treatment LK1. who

76. 77 (28), 22-80. connecting the upper shaft S1 as the rotating shaft and the frame FR and the second four-crank mechanism LK2, which consists of four rods 22, 21, 82, 83.

using one linkage 79 of the first four-crank mechanism LK1 and the joint N4 of the frame FR and using the drive portion 751 of the clutch 75 as the other linkage 82. In the first four-click mechanism LK1. the rod 78 is attached to the rod 22 while the rod 78 is connected to the rod 80. Now the rod 76 is a fixed rod.

In the embodiment shown in Fig. 11, the motion transfer mechanism 71 serves to transmit movement from the mechanism that drives the needle thread hook 730 up and down using the power transmitted from the upper shaft S1 as a rotating shaft and transmitting the motion to the up and down movement . However, the motion transfer mechanism 71 may serve to transmit movement from the mechanism that drives the needle 10 up and down using the power transmitted from the upper shaft S1 as a rotating shaft and transmitting the movement to the up and down movement of the shearer 72. The needle thread gripper 730 is driven up and down by the energy transmitted from the upper shaft S1 by four rods 76, 77 (78), 22, 80.

··, ··

The clutch 75 comprises, as shown in FIGS. 10 and 13, a pin 84 which is formed on the second rod 82 as a drive portion 751 and a longitudinal groove 85 which is formed in the upper cutter 72 as a drive portion 741 and in which the pin 84 is saved. Pin 84. which forms the drive portion 753 is screwed into the mounting hole 752 formed in the lower bent portion of the second rod 82 using the nut 763.

The cutter drive portion 74, the lower cutter 73 is slidably mounted on the cutter drive plate 742 that forms the drive portion 741. To achieve this sliding structure, the lower cutter 73 is attached to the slide plate 744 by small screws 743. The protrusion 746 of the rotatable movable member 745 is mounted in the aperture 747 of the slide plate 744 and the aperture 748 of the shearer drive plate 742 and the rotary movable plate 745 are fixed to the stop 749 by small screws 760. the plate 744. i.e. the lower cutter 73 in relative dimensional relationship between the holes 747, 74 8 and the projection

The top cutter 72 is removably mounted on the cutter drive plate 742 of the cutter drive portion 74 by means of a pin 761. The cutter drive portion 74 is provided with a cutter-side compression spring 88 that urges the top cutter 72 to the bottom cutter 73. the trimmer is formed by a U-shaped resilient member and is rotatably mounted on the sliding plate 744 by a pin 763. In a state where the top cutter 72 is mounted on the trimmer drive plate 742 by a pin 761. on the cutter side, it is retained and the upper cutter 72 is pressed against the lower cutters 73.

As shown in Figures 14 and 15, the lower trimmer 73 includes a positioning locking portion 87 that positions the trimmer drive portion 74 to the positioning recessed portion 86a of the positioning plate 86 formed at the needle plate 8 at the needle punching position PS during operation. . The positioning plate 86 provided with the positioning recessed portion 86a is formed such that the positioning of the positioning plate 86 can be adjusted to the right and left to vary the stitch width W at the needle punching position PS. Ie. the positioning plate 86 is included in the suture plate 8 in such a way that the positioning plate 86 can adjust its position to the right and left, while the positioning of the positioning plate 86 can be adjusted in the direction of the stitch width W to the recessed portion 8a formed in the suture plate. When the positioning plate is adjusted, it is attached to the needle plate 8 by screws or below.

The lower trimmer 73 is slidably mounted in the trimmer drive portion 74 and the trimmer drive portion 74 is provided with a position biasing member 89 that presses the positioning locking portion 86 into the positioning recessed portion 86a of the positioning plate 86 formed in the stitch plate 8 at the time of trimming. The positioning biasing member 89 is disposed between the rotatable movable member 745 and the receiving plate 764, which is secured by a pin 763 inserted into a mounting hole formed in the rotatable movable member 745 and urges the positioning engagement member 87 into the positioning recessed portion 86a of the positioning plate 86 at execution. trimming.

The rotatably movable cutter drive member 745 is rotatably mounted in the rotary bore 767 of the stop 766 by means of a pin 765. The stop 766 is secured to the frame FR by the stop arm 768. Thus, the cutter drive portion 74 is rotatably supported on the frame FR and slidably guides the upper blade 72.

Further, as shown in Fig. 16, without the use of the positioning biasing member 89 and the take-up plate 764. the lower cutter 73 can be slidably received in the cutter drive portion 74 and the cutter drive portion 74 can be provided with a positioning eccentric cam 90 a locking plate 86 formed in the suture plate 8 at the time of trimming. The trimmer drive portion 74 provided with the eccentric cam 90 includes a trimmer drive body 942 having a groove 85 in which a pin 84 of the drive portion 751 forming part of the clutch 75 is mounted and to which an upper cutter 72, a slide guide 946 is mounted. parallel to the trimmer drive body 942, a slide body 944 which is disposed parallel to the slide guide 946 and to which the lower cutters are attached, and a sliding shaft 948 on which three parts are arranged: the trimmer drive body 942, the slide guide 946 and sliding body 944.

The sliding guide body 946 is provided with a guide groove in which a projection formed on the sliding body 944 and a rotatably movable member 945 that slidably engages with the sliding body 944 is slidably mounted in the axial direction of the sliding shaft 946. the body 946 is attached to the sliding shaft 948 by a small screw. The slider 944 is provided with a groove portion that functions as a cam follower at one end thereof and moves up and down by rotating the positioning cam 90, which is rotatably mounted by manipulating the manipulation knob 91 about the bore axis formed in the rotatable movable member 945. Further, the shear-side biasing member 950 is attached to the shear drive body 942, which presses the upper shearer 72 onto the lower shearer 73. Further, the rotatable movable member 945 of the shearer drive portion 74 is rotatably mounted in the rotary bore 767 of the stop 766 attached to the FR frame by the stop arm 768, the shearers rotatably mounted on the FR frame of the shredder 72.

pin. The stop 766 is thus the drive portion 74 and slidably guides the top

In a trimmer drive portion 74 having such a structure, by rotating the manipulation knob 91, the positioning eccentric cam is displaced such that the lower trimmer 73 moves up and down, and therefore, the positioning locking portion 87 is lower

U-LCJZiClid

In the positioning plate 86 formed in the needle plate 8, it can be released. Further, by rotating the manipulation knob 91, the lower cutter 73 moves downward and therefore the positioning locking portion 87 of the lower cutter 73 can be received in the positioning recessed portion 86a formed in the suture plate 8.

The operation of the lock / overlock stitch operation performed by the lock / overlock stitch machine having the above construction is explained below.

Now, the bound / overlock stitch stitch comprises, as shown in Fig. 2, the overlocked stitch portion 6 comprising the upper thread 1 and the lower thread 2 and the overlock portion 1 comprising two loop threads consisting of the upper loop thread 3 and the lower loop thread 4, wherein the stitch is formed by making the bound portion 6 and the overlying portion 7 intersect. Ie. upper thread 1 and resp. the lower thread 2 forms stitches 1a, 2a on the upper surface 5a and the lower work surface 5b, e.g. a fabric having a two-layer structure that is parallel to the fabric surface and the upper thread 1 and the lower thread 2 intertwine in the vertical direction 1, e.g. in the middle in the direction of the thickness of the fabric, so that a stitch is formed which penetrates the fabric 5, thereby forming a bound portion 6 of the stitch.

On the other hand, the upper looping thread 3, the upper looping thread 3 and the lower looping thread 4 serve to form an overlying portion 7 that can prevent fraying of the edge portion 5c of the fabric 5, the upper looping thread 2 and the lower looping thread 4 intertwine with each other. on the edge portion 5c of the fabric 5, the upper looping thread 3 penetrates into the upper surface 5a of the fabric 5 and intersects the upper end of the bound portion 6 and the lower looping thread 4 penetrates into the lower surface 5b of the fabric 5 and intersects the lower end of the bound portion 6. stitch.

Thus, the knotted / overlock stitch is formed by the upper thread 1 which forms a single thread, the lower thread 2 which forms the swivel hook thread and the two loop threads 3, 4, wherein the overlock portion 7 of the stitch formed by the loop threads 3, 4 part 6, formed by the upper thread 1 and the lower thread 6 on both sides of the fabric 7 so that the bound and the overlock stitches are connected to each other, thus forming a stitch.

In a lockstitch / overlock stitch making machine, by stitching both the overlock and overlock stitches to first perform overlock stitches, the stitch changer NB knob controls the sewing person by, for example, selecting linear stitches and adjusting the offset to the optimum size for the overlock stitch such that the shaft 111 of the stitch changer 110 of the stitch changing device 110 is rotated to a position where the lock pin 536b of the needle punch transfer arm 536 is inserted into the recessed portion 527 of the needle punch changer cam 527 (FIGS. 3 and 4).

Thus, when the sewing person presses the knob of the overlock stitch converter BT against the biasing force of the compression spring 534, the distal end of the overlock stitch knob BT presses the needle stroke transfer plate receiving portion 532a of the needle stitch control portion 520 to transfer the holding plate 532 needle needle rotated counterclockwise. As a result of this rotation, the needle needle transfer plate retainer 532b stop 532b retracts and therefore the needle needle transfer arm 536 supported by this detent 532b rotates rotates clockwise about the stepped bolt 537 as the center, with the biasing force of the tension spring 53 8. Therefore, the lock pin 515b of the needle stitch 536 is inserted into the recessed portion portion 627a of the cam follower until the lock pin 515b contacts the bottom surface of the recessed portion 527a (FIGS. 3 and 4).

Further, when the needle needle transfer arm 536 rotates clockwise about the stepped screw 537 as the center, the center needle arm 536c of the needle needle transfer arm 536 pushes the needle needle transfer rod 539 connected to the needle needle transfer arm 536 up and the adjusting plate 521 is aligned. the needle pawl 522, which are integrally formed, rotates clockwise. Due to this rotation, the needle punch transfer pawl 522 moves the needle bar pull rod 526, which is biased to the left by the tension spring 529. in the right direction by the needle punch transfer pin 526d attached to the needle bar pull rod 526 (FIGS. 1 and 2). . Therefore, irrespective of controlling the needle stitching position by the stitch-changing device 110, the needle stitching position may be moved to the rightmost position that is optimal for overlocking. In order to avoid deteriorating the accuracy of the needle position at the rightmost position, optimum for overlocking, which may become a component failure as such or a system failure, the needle needle transfer pawl 522 is attached to the needle needle adjuster plate 521 by a screw and needle, the bolt 525 is loosened and the needle punch transfer latch 522 may be adjusted.

Further, when the needle needle transfer arm 536 rotates clockwise about the stepped screw as the center, the clutch adjusting rod 501 moves to the left by a clutch control rod 511 connected to the end portion of the lower arm 536d of the needle needle transfer arm 536 (FIG. 1). , 3, 4 and 6). Therefore, the distal L-shaped end portion 501a of the clutch link rod 501 is disposed in the movable groove 505a and 711 bpn £ bi Rfm bnhri bripmbn rwi z, x_xx_xx_. w - + Η_> χχχ_, χχ_ζ in x_xxx_x x_z <_, x ^ x-zx-xxx-xxx ^ .xx ^ - x ^

The looped MT3 moves the drive side gear 505 to the left to slide out of the drive side recessed portion 505b from the looper worm gear stop 503 and for the drive side clutch pawl 505a to engage the recessed part 506a of the clutch catcher 506 mounted on the lower shaft S2 (Fig. 9 (b)). Therefore, the rotational movement of the lower shaft S2 is transmitted to the driven side gear 509 by the driving side gear 505 so that the upper loop 30 and the lower loop 40 of the drive portion of the loop may be driven.

In this state, when the upper loop 30 and the lower loop 40 of the loop portion 40 of the loop can be driven, the knotted portion 6 of the stitch is formed such that the upper thread 1 passing through the needle 10 penetrates the fabric 5 and downwardly formed by the drive portion MT1 of the needle bar and then the tip 21 of the hook of the pivot hook 20 engages the upper thread 1 at the point R when the needle 10 begins to lift from the lowest position so that the upper thread 1 and lower thread 2 intertwine; the lower thread 2 is pulled up when the upper thread 1 is pulled up by the needle 10 and the looper hook 730. By repeating the above operation at each feed feed, a continuous bound portion of the stitch is formed (FIG. 2).

Further, in forming the overlock portion 7 of the stitch, when the upper loop 30 arranged in the uppermost position moves up and down the upper loop fastening arm 64, the upper loop thread 3 is caught by the needle 10 at the midpoint 6 of the lower loop upper fastening arm 64 and hence the upper end. the stitching portion 6 of the stitch and the upper looping thread 3 intertwine on the upper surface of the fabric 5 (Fig. 8 (a)).

Then, while the lower loop fastening arm 63 is reciprocating to the left and right, the lower loop 4 of the lower loop 40 moving to the right of the left position is caught by the needle 10 descending from the uppermost position at point Q and therefore the lower end The stitch portions 6 and the lower loop thread 4 intersect at the bottom of the fabric (FIG. 8 (b ()). Further, while the lower loop fastening arm 63 is reciprocating to the right and left, the lower loop loop 4 of the lower loop 40 retracting to the right, it is engaged by the upper loop 30, lifted from its lowest position by the upper loop fastening arm 64 at point S, and therefore the upper loop thread 3 and the lower loop thread 4 lock together on the edge portion 5c of the fabric 5. wherein the overlap portion 2 is formed (FIG. 2) With a stitch feed as a cycle, a stitch can be achieved that is performed by the overlock portion 2 intersecting the respective lock stitch at each stitch.

Furthermore, the rotational movement of the rotary shaft of the sewing machine, e.g. is converted to up and down movement by the motion transfer mechanism 71 (FIGS. 1, 10, 11 and

12), which is driven counterclockwise by the above rotary motion. Ie. when the upper shaft S rotates, the first »· · ·· ♦« φ, · '♦ · φ *>

The four-lever mechanism LK1 is rocked when the rods 77, 78 are used as handles and the rod 80 is used as a connecting rod and the rod 79 is used as a swing arm. By swinging the linkage 79, the linkage 81 of the second four-click mechanism LK2 is rocking and the linkage 82 and therefore the drive portion 751 of the clutch 75 performs up and down movement. Now the rod 82 moves along an elliptical orbit as a result of the LK1 four-click mechanism. LK2 and performs a substantially straight line in the vertical direction at PL near the drive portion 751 so that the reaction from the cutter drive portion 74 is supported by the guide pin 754.

Ήθ / 4 and DT. b O Vt 1 OQO tz · + - a v * cs t * \ ν · / \ <-i T-Ί o · ~ 7 τ '10oN 1 νΊ om τ rz-s ζ-Ί 4 ζ-ι τ * ra z- \ Ί— τ ν 'zrsrai CC o xy K_Z Ct UZ jjj f J \ LCJ C. In the guide plate 755 attached to the FR frame (Figs. 10, 11 and 11), the alignment of the frame (Figs.

13). As a result of such a design, the lateral movement of the drive portion 751 is limited and only the up and down movement can have a stroke t (Fig. 11) per revolution of the upper shaft S1.

The upward and downward movement obtained by the motion transmission performed by the motion transmission mechanism 71 is transmitted to the upper cutter 72 via the pin 84 of the clutch 75 driving portion 751 and the longitudinal groove 85 in which the pin 84 of the cutter drive plate 742 is cut. forms a drive portion 741. In the operation of the cutter (FIG. 14), the positioning locking portion 87 of the lower cutter 73 is inserted into the positioning recessed portion 86a of the positioning plate 86 formed at the stitch plate 8 so that the cutter drive portion 74 is positioned at the stitch position The PS needle 10 of the upper cutter 72 is slidably guided in the sliding plate 744 of the drive plate 742 of the cutter drive portion 74 rotatably mounted on the frame FR. In this operating state of the shredder, the shredder drive portion 74 is held vertically on the pin 765 and the longitudinal direction of the longitudinal groove 85 is directed horizontally, the pin 84 of the clutch 75 driving portion 751 and the longitudinal groove 85 of the drive portion 741 transmitted to the top cutter 72 at the time of cutting by the cutter drive portion 74.

·· · '·· <»

Therefore, the rim 5c of the fabric 5 is cut off by an upper cutter 72 that performs up and down movement and a lower cutter 73 that cooperates with the upper cutter 72.

Thus, by performing the bound stitch and the like. while simultaneously cutting off the edge 5c of the fabric 5, it is also possible to perform the overlock stitches simultaneously with the bound ones.

Further, when converting the overlock stitch to the lockstitch by selecting a stitch other than the linear stitch by manipulating the stitch changer knob after the sewing machine is stopped, the shaft 11i makes the stitch change rotate and the lock pin 536b of the needle stitch transfer arm 536 slides out of the recess 527a. needle needle transfer cams 527, firmly locked in position by the stitch changer shaft 111, and therefore needle needle transfer arm 536 rotates counterclockwise around stepped screw 37 as the center against biasing force of tension spring 538 (Figs. 1, 3 and 4) . Therefore, the center needle arm 536c of the needle needle transfer arm 536 pulls the needle needle transfer rod 539 associated with the needle needle transfer arm 536 down, and therefore the needle needle adjustment plate 521 and the needle needle transfer pawl 522 rotate counterclockwise. . When the needle puncture transmission pawl 522 is rotated counterclockwise, the needle bar pull rod 526 moves to the left by the biasing force of the tension spring 529, and therefore, the optimum stitch position can be obtained.

Further, when the needle needle transfer arm 536 rotates counterclockwise about the stepped screw as the center, the lower needle needle transfer arm 536d 536 forces the clutch control arm 511 to move to the right. However, when the drive side of the drive worm gear MT3 of the looper and the drive end stop 503 of the drive gear worm 505 are not recessed 505b.

The loop worm gear fixed to the FR frame can be positioned in the same position and cannot get in contact with each other. In the above aspect, the needle needle transfer arm 536 forces a stepped bolt 514 attached to the lower arm 536d. to move to the right in the longitudinal bore 511a of the clutch control rod 511 against the biasing force of the tension spring 517 (FIGS. 1, 3, 4, 6 and

9). Therefore, by rotating the handwheel HP affixed to the upper shaft S1 to the lowest position of the upper loop 30, when the loop drive worm gear stop 503 is inserted into the recessed portion 505b of the drive side gear 505, the clutch control rod 511 moves upright due to the biasing spring tension. 517 such that the distal L-shaped portion 501a of the clutch link rod 501 inserted into the moving groove 505a of the drive side gear 505 can move the drive side gear 505 to the right. Therefore, the drive side clutch pawl 505c slides out of the recessed portion 506a of the clutch catcher 506 mounted on the lower shaft 82 and hence the rotational movement of the lower shaft S2 is interrupted so that the drive side gear 505 cannot rotate and becomes displaceable. the upper loop 30 and the lower loop 40 of the loop portion 60 of the loop to a given position below the suture plate 8.

In the embodiment described above, although the upper loop threads 3 and 3, respectively. the lower loop thread 4 intersects all adjacent bound parts 6 of the stitch, the overlock portions 7 of the stitch can intersect the bound part 6 of the stitch as shown, for example, in Fig. 17 (b). In this case, the rotation speed ratio between the lower shaft S2 and the loop portion 60 may be adjusted such that the upper loop 30 and the lower loop 40 perform one cycle motion for only one cycle outside the two needle motion cycles.

φ · »φ φ φ φ φ φ φ φ φ φ φ φ

φ φ · · φ φ · φ φ

Further, even if the stitches 1a, 2a are the upper threads 1 and 2, respectively. the lower threads 2 in this embodiment are linear, each stitch may also have a zigzag shape as shown in Fig. 17 (c) or may be in the polygonal line of each or more stitches.

On the other hand, until the stitch changer knob BT is pushed even if the needle needle transfer arm 536 is biased clockwise around the stepped screw as the center, by the biasing force of the tension spring 538, the rotation of the upper arm 536a of the needle needle transfer arm 536 is limited by holding of needle stitch portion 532b of retaining plate 532 of needle transfer arm 536. Therefore, even when the stitch changer NB is selected by manipulating the stitch changer knob NB, the lock pin 536b of the needle needle transfer arm 536 is not engaged in the recessed portion 527a of the needle needle transfer cam 527 (FIGS. 1 and 3). Further, if other stitches are selected, because the stitch changer knob NB is manipulated so that the stitch can be made and therefore the stitch changer shaft 111 of the stitch changing device 110 rotates to a position where the lock pin 536b of the needle needle transfer arm 536 cannot be inserted. into the recessed portion 527a of the needle needle transfer arm 527 (FIGS. 1 and 3).

Therefore, in such a condition, the needle puncture transmission pawl 522 cannot force the needle bar tension spring 526 to move to the right, and the clutch adjusting rod 501 of the clutch actuating portion 510 moves to the right due to the biasing force of the pulling spring 517. side of the clutch 500 extends from the recessed portion 506a of the clutch catcher 506 (FIG. 9 (a)). Therefore, the worm gear stop 503 engages the drive side gear recessed portion 505b 505 to interrupt the rotational movement of the lower shaft S2 and thus prevent rotation of the drive side gear 505, wherein the upper loop 30 and the lower loop 40 of the loop portion 60 may be moved to the given position under the needle plate 8 ..

φ φ · · · · · · · 2 φ · 2 φ · · · · · · · · 2 2 2 2 2 2 2

Further, in the cutter idle state shown in Fig. 15, when only the bound stitch without cutting the edge 5c of the fabric 5 is required, the slide plate 744 is raised or the eccentric cam 90 is rotated by manipulating the knob 91 (Fig. 16). the lower chopper positioning plate 87 is inserted in the positioning recessed portion 86a of the positioning plate 86 formed by the throat plate 8, is released and the cutter drive portion 74 is rotatably moved about the pin 765 to move to the displaced position in the displaced state. Therefore, the longitudinal direction of the longitudinal groove 85 is directed in the vertical direction, and hence the pin 84 of the clutch drive portion 751 moves only in the longitudinal groove 85 of the drive portion 741 with clearance so that the power transmission to the top cutter 72 can be interrupted.

In this way, by simply manipulating the rotational movement of the cutter drive portion 74 to a shifted position in the horizontal state, the sewing method can be changed such that only the bound stitch is performed without cutting the edge 5c of the fabric 5.

In a preferred embodiment in which the sewing machine cutter and looped drive mechanism of the present invention is applied to a lockstitch / overlock stitch machine, a horizontal pivoting hook is used to effect horizontal movement. However, the present invention is not limited to such a swivel hook and each swivel hook can be used as long as the swivel hook can interlock the upper thread and the lower thread while lifting the upper thread that passes the needle from the lowest needle position to form a knotted portion made of stitches parallel. with the work area and stitches perpendicular to the work area.

Further, the trimmer drive mechanism 70, the needle puncture drive portion 50 and the clutch actuation portion 510 are not limited to

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9999 of the above construction. If the cutter drive mechanism 70 can perform stitches while changing the lockstitch operation after cutting the fabric edge and the lockstitch operation without cutting the fabric edge, the needle stitch control portion 520 moves the needle stitch position in a blocking manner by manipulating the knob BT of the overlock stitch, the clutch 500 allows forming the bound stitch portion 6 and the stitching portion 7 at the time that the stitching portion 7 is formed and only the bound stitch portion 6 is formed at the time the bound portion 6 is formed, and the clutch drive portion 510 can control the clutch 500 By blocking the knob NB stitch changer, all constructions can be used.

Further, the loop portion 60 of the loop is not limited to the above construction. If the loop portion 60 of the loop has a structure, the upper loop 30 and the loop 30, respectively. the lower loops 40 are arranged below the suture plate 8, respectively. the loops 31, 41 of its loop are arranged in the same direction so that the loops 31, 41 of the looper extend in front of the needle 10 in the sewing direction, the upper loop 40 and the lower loop 40 are driven so that the upper loop 30 and the lower loop 40 movements having planes in planes substantially parallel to each other, the upper looping thread 3 passing through the upper loop 30 performs a reciprocating movement over an arcuate path that intersects the path of the needle 10 above the needle plate 8 and passes through the needle plate 8 is caught by the needle 10 in the uppermost position, when the upper loop 30 descends from the uppermost position, the lower loop loop 4, which passes through the lower loop 40, which reciprocates along the path L40 that intersects the path L10 of the needle 10 and the path L30 of the upper loop 30 below the stitch plate 8. is captured by the descending needle 10 below the suture plate 8 as the lower loop 40 moves from one end to the other end of the track 40 and the lower loop 4 is caught by the upper loop 30 rising from the lowest position as the lower loop moves »

to the other end, wherein the upper loop thread 3 and the lower loop thread 4 are looped together at the edge portion 5c of the work 5 and at the same time the upper loop thread 3 loops with the bound portion 6 over the upper surface 5a of the work 5 and the lower loop thread 4 is captured by the bound stitch portion 6 over the bottom surface 5b of the work 5 and so the overlock portion 7 of the stitch is formed, the loop portion 60 of the loop may be of any construction.

Further, the sewing machine cutter drive mechanism of the present invention can be applied to the sewing machine g. 18, which is not provided with the loop drive mechanism 50 described above. In this case, as shown in FIGS. 19 and 20, the needle 10 through which the upper thread passes is moving up and down the path L10 in the vertical direction to the needle plate 8 corresponding to the rotation of the upper shaft S1. As in the case of a conventional lockstitch, the lockstitch is performed so that the upper thread 1 passing through the needle 10 penetrates the fabric 5, followed by the upward and downward movement of the needle 10, and then R when the needle 10 begins to lift from the lowest position together with the rotation of the lower shaft S2. which is synchronized with the lower shaft S1 so that the upper thread 1 and the lower thread 2 intertwine with each other and further, the lower thread 2 is pulled up when the upper thread 1 is pulled up by the needle 10 which returns up and the loop thread is lifted 73 0 (FIG. 11). the lower thread 2 forms stitches 1a, 2a on the upper surface 5a and the lower work surface 5b, e.g., a fabric 2 having two layers that are parallel to the fabric surface and the upper thread 1 and the lower thread 2 intertwine in the vertical direction of the fabric 5, eg in the center in the thickness direction and so a stitch is formed which penetrates the fabric 5 and therefore, by repeating the above operation, a continuous bound portion of the stitch 6 is formed at each stitching.

··

Further, the drive mechanism of the sewing machine of the present invention is not limited to the aforesaid trimmer drive mechanism 70 and may be the trimmer drive mechanism 700 shown in Figure 21.

This cutter drive mechanism 700, as well as the above-described drive mechanism 70, cuts the edge 5c of the fabric 5. (Figs. 2, 19, 20) by an upper cutter 72 that performs up and down movement through the motion transfer mechanism 71 (Figs. 22, 11). ), which is actuated in a blocking manner with the upper shaft S1 and the lower cutter 73, which is operated in cooperation with the upper cutter 72.

The cutter drive mechanism 700 of the lockstitch machine is provided with a cutter drive portion 710 (FIGS. 21, 22) which is mounted on the frame FR and slidably guides the top cutters 72.

The motion transfer mechanism 71 is coupled to the upper cutter 72 via a clutch 750 (FIG. 22), which transfers power to the upper cutters 72 at the time of trimming the cutter drive portion 710 and rotates the cutter drive portion 710 to the moved position and interrupts the energy transfer. during the rest position of the cutter drive portion 710.

The motion transmission mechanism 71 has already been explained in connection with FIGS. 1, 10, 11 and 12 and therefore its explanation is omitted.

The clutch 750 includes, as shown in FIG. 22, a pin 84, which is formed as a drive portion 751 on the link 82 and a longitudinal groove 702. which is formed in the upper cutter 72 as a driven portion 701 and into which the pin 84 is inserted. . The pin 84 is screwed into the mounting hole 752 (FIG. 13) formed in the lower bent portion of another arm 82 that forms the drive portion 751 using the nut 753.

As shown in FIG. 23, the trimmer drive portion 710 includes a drive block 711 of the upper cutter 72 that is provided with a longitudinal groove 702 (FIG. 22) in which the pin 84 of the drive portion 751 is mounted to which the upper cutter 72 is attached. ., a shearer sliding body 712 arranged parallel to the shearer drive block 711, a lower shear fastening block 713, arranged parallel to the slider body 712 and to which the shearer 73 and the shear slider 714 are mounted on which the three parts are slidably mounted the top cutter drive block 711, the cutter slide body 712, and the cutter fastening block 713, the top cutter 72 and the bottom cutter 73 are arranged to cut the fabric.

The shearer sliding body 712 is provided with a guide groove 712a in which a protrusion formed on the lower shear fastening block 713 is slidably mounted in the axial direction of the shear slider shaft 714. Further, the shearing unit base 715, which rotatably mounts the shearing drive portion 710 to the frame itself, is attached to the shearing slider 712. In particular, the top part 715a of the cutter base 715a is rotatably mounted, for example, by means of a stepped pin 717 or the like, on the base plate 716 of the shearing unit which is fixed to the frame by screws or the like. This stepped pin 717 is inserted from the side of the shearing unit base mounting plate 716 by a resilient washer 722 such as a corrugated resilient washer or the like. and may control rotation of the shear unit when the base 715 rotates the base 715 Further, a stop 715b is formed at the upper end portion of the shear unit base 715 and a protrusion 716a is formed on the fastening side of the shear unit base 715 of the shear unit base plate. Due to this design, when the shearing unit base 715 is rotated downward from the horizontal direction that constitutes the shifted position, further rotation of the shearing unit base 715 is prevented. Still further, the shear unit base 715 is bent into an L-shape such that the shear unit base 715 can overlap the shearer sliding body 712 and the two adjacent surfaces of the shear slider 712 and the lower shear attachment block 713. Now, the shearer sliding body 712 is attached to the shearer sliding shaft 714 by threaded members such as small screws.

The lower shear fastening block 713 is provided with a grooved portion 713b and the grooved portion 713b engages a positioning lever 718 that is loosely received in a notch 715c formed in a bent portion of the shear unit base 715 that is attached to the shearer sliding body 712. In particular, the positioning lever 718 is provided with a semi-pressed protrusion 718a. which forms a rotatable shaft used as a support, and the protrusion 718a is rotatably mounted in a mounting hole 715d. formed in the base 715 of the shearing unit. Further, the protrusion 718b. which forms a load point, is formed at one end of the positioning lever 718, and the projection 718b engages the groove portion 713b of the lower shear fastening block 713. Therefore, the positioning lever 718 is clamped between the shearing unit base 715 and the lower shearing attachment block 713 and therefore, by manipulating and rotating the parts 718c. which is formed at the other end of the positioning lever 718c and becomes the point where the positioning lever pushes upwardly, the lower shear fastening block 713 sinks while sliding along the shearer sliding shaft 714. On the other hand, by rotating the handling portion 718c down, the lower shear fastening block 713 rises or rises while sliding along the shear slider shaft 714. The recessed stop portion 718c is formed on the rear face of the protruding portion 718b of the positioning lever 718. When the positioning lever is manipulated upwardly so that the lower cutter falls to a given position, the stopper protrusion 715e formed on the cutting unit base 715 protruding is located in the recessed part 718c of the stop.

the lower cutter mounting block 713 includes, as in the above-described cutter drive mechanism 70, a positioning locking portion 87 which positions the cutter drive portion 710 into the positioning recessed portion 86a of the positioning plate 86 formed in the needle plate 8 to the needle puncture position PS needles 10 at the time of trimming (FIGS. 25, 26). The positioning plate 86 provided with the positioning recessed portion 86a is formed such that the positioning of the positioning plate 86 can be adjusted in the right and left directions to change the stitch width W to the needle puncture position PS. Ie. the positioning plate 86 is included in the suture plate 8 so that the position of the positioning plate 86 can be adjusted to the right and left, wherein the positioning of the positioning plate 86 can be adjusted in the direction of stitch width W to the recessed portion 8a formed in the suture plate 8. , the positioning plate 86 is attached to the needle plate 8 by screws or the like.

On the other hand, the upper cutter drive block 711 includes a grooved portion 711a, and the upper cutter elastic plate 719 is received in the grooved portion 711a and secured thereto by threaded members 720 such as screws. This resilient plate 719 of the upper cutter 719 is formed to have a length that allows it to extend from the drive block 711 of the upper cutter to be. Slidably and loosely received in a guide groove 712a formed in the slider body 712 of the shearer. By using threaded members 721 such as screws, the upper cutter 72 is attached to the upper cutter portion 719a of the flexible plate 719 extending from the upper cutter drive block 711. The extended portion 719a of the upper plate cutter spring plate 719 is bent to press the upper cutter 72 against the lower cutter 73 positively biased by the flexible plate 719 of the upper cutter 72.

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O UJ kJ V k j 'lil VV * 2 U · l _ \ _. XX \ _ ~ lll f' f and Rf Vnvnn irnncl b ^- r rnLr Ί time of the overcast stitching the lock stitching by cutting a fabric edge, as is shown in Fig. 24 (a) when the positioning lever 718 of the upper cutter drive portion 710 sinks to a given position and the lower cutter 73 comes to a standstill when the lower cutter 73 is moved to the moved position by the lower block 73 fastening block 713. the positioning lever 718 moves upward as shown in FIG. 24 (b). As a result of this movement, a lower trimmer 73 is mounted on the lower trimmer mounting block 713 having a grooved portion 713b. in which the protrusion 718b of the positioning lever 718 is lowered so that the positioning locking portion 87 of the lower shearer 73 is received in the positioning recessed portion 86a of the positioning plate 86 formed in the throat plate 8 so as to operate the shearer (FIG. 25). the cutter drive portion 710 positioned at the needle puncture position PS 10 could be positioned. Now, since the protruding portion 715e formed on the shearing unit base 715 in a protruding manner is replaceably received by a force in the recessed portion 718c of the stop formed in the positioning lever 718, the return of the positioning lever 718 can be prevented.

19 and 20, the needle 10 through which the upper thread 1 passes, moves upwards

and down the path LIO in the vertical direction to the throat plate 8 simultaneously with the rotation of the upper shaft S1. When performing the knotted stitch, in the same manner as the conventional knotted stitch, the upper thread 1 passing through the needle 10 penetrates the fabric 5, following the up and down movement of the needle 10 and then the twist hook 20 of the rotary hook 20 engages the upper thread 1 while rotating the lower shaft. S2. which is synchronized with the upper shaft S1 at the point R when the needle 10 starts to lift from the lowest position so that the upper thread 1 and the lower thread 2 intertwine with each other, and then the lower link 82 passes along the lower shaft 82. The throttle mechanism LK1, LK2 extends along an approximately straight path in a vertical direction at the point PL near the drive portion 751 so that the reaction from the cutter drive portion 74 is supported by a guide pin 754 retained at the point PL of the rod 82 that passes through the longitudinal guide hole 755a. formed in a guide plate 755 attached to the frame FR. As a result of this construction, the lateral movement of the drive portion 751 is limited, and with the stroke t (Fig. 11) only upward and downward movement per revolution of the upper shaft S1 can be achieved.

The upward and downward movement obtained by the motion transmission mechanism 71 is transmitted to the upper shearer 72 via the pin 84 of the clutch drive part 751 and the longitudinal groove 702. in which the pin 84 of the upper cutter drive block 711 of the shearer drive part 710 forms the drive part. 701. In the operative state of the cutter (FIG. 25), the positioning locking portion 87 of the lower cutter 73 is received in the positioning recessed portion 86a of the positioning plate 86 formed in the suture plate 8 so that the cutter drive portion 710 is positioned at the needle puncture position PS. needles 10. the upper shearer 72 is slidably guided in the guide groove 712a of the shearer body 712 through the upper shear spring plate 719 using the drive block 711 of the shear drive part 710, which is rotatably mounted on the frame FR. IN

In this operating condition of the shredder, the shredder drive portion 710 is held vertically around the stepped pin 16 and the longitudinal direction of the longitudinal bore 702 is directed in the horizontal direction, the pin 84 of the clutch drive portion 751 and the longitudinal groove 702 of the drive portion 701 transferred to the top cutter 72 while the cutter drive portion 710 is being cut. Therefore, the rim 5c of the fabric 5 is cut off by an upper cutter 72 which performs up and down movement and a lower cutter 73. which is controlled to work with

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Thus, by performing a zigzag stitch or the like. when cutting the edge 5c of the fabric 5, it is possible to perform the overlock stitch simultaneously with the bound stitch.

Now, in the standstill of the cutter, where only the bound stitch is required without cutting the edge 5c of the textile 5, as shown in Fig. 24 (a) and Fig. 26, the positioning lever 718 moves down. This releases the condition that the lower trimmer attached to the lower trimmer mounting block 713 is raised and the positioning locking portion 87 of the lower trimmer 73 is received in the positioning recessed portion 86a of the positioning plate 86 formed in the suture plate 8. the longitudinal direction of the longitudinal groove 702 is directed in the vertical direction and therefore the pin 84 of the drive portion 751 of the clutch 750 only moves in the longitudinal bore 702 of the drive portion 701 with play and energy transfer the top cutters are interrupted. Further, when the cutter drive portion 710 is rotatably moved, the bolt 723 having a cup head that secures the cutter slider 712 to the cutter unit base 715 hits the cutter base fastening plate 716. . The unit and the shear unit base 715 are inclined by the damping function of the resilient brake pad 722 and pass over the shear unit base plate 716 and then slid into the recessed portion 716b. formed in the fastening plate 716 of the shearing unit base 715. As a result, the trimmer drive portion 710 is semi-rigidly secured, and it is therefore possible to prevent the drive portion 710 from sliding downward due to vibrations or the like generated by the sewing machine.

* P O 1 / Ή O ~ 1 / Ί T ~ l / - “i 1 i z—» V · »Z“ \ »» 1 ΥΎΆ - <ν '! η ν ~ \ · χ τ Π —x z—, 4 * z-, · »—x z- \ T z — x V-» z-st τ-χ λ -ť -v—. -i lr x ’Ί Q xuoyoo j k-ouiOOiuoiio here. Only the rotary movement of the cutter drive portion 710 from the working position in the position of the cutter drive portion 710 can be rotated. vertical state to the moved position in the horizontal state, the operation can be changed to perform only the bound stitch without cutting the edge 5c of the fabric 5.

The trimmer drive portion of the sewing machine trimmer drive mechanism of the present invention is not limited to the above-described design and any design can be used as long as the lower trimmer can be slidably supported and has a positioning lever to position the locking block in the positioning recessed portion at the time of trimming.

Industrial applicability

As described herein, in the loop mechanism of the sewing machine of the present invention, the upper loop and the upper loop are respectively the same. the lower loop arranged below the throat plate, respectively. their hook tips are arranged in the same direction so that the hook tips extend along the front of the needle in the sewing direction, the upper loop and the lower loop may be driven such that the upper loop and the lower loop perform movements having paths in planes substantially parallel to each other wherein the loop drive mechanism has both a knotted stitch and an overlock stitch. Furthermore, it is possible to firmly sew several fabrics together, and at the same time to wrap the edge portions of the fabrics. Even further, labor and stapling costs are minimized.

Further, in the loop mechanism of the sewing machine of the present invention, the lockstitch and overlock stitch can be made separately using a needle and two loops, and therefore, the suture of the present invention can be realized easily at a low cost with a single sewing machine. Further, in this case, changing this stitch for another stitch can easily be accomplished by an extremely small change.

Further, the clutch may be rearranged such that the clutch forms a bound portion of the stitch and the stitching portion of the stitch by transmitting power from the lower shaft to the loop drive shaft while executing the stitching portion of the stitch and executing the stitched portion by moving the lower loop to the lowest position and interrupting power transmission from the lower shafts on the loop drive shaft at the time of the locked part of the stitch. This can save work and the time required to perform the lockstitch and overlock stitch separately.

Still further, in the sewing machine drive mechanism of the present invention, the shearing portion of the shearing mechanism may be incorporated into the existing sewing machine space and it is therefore possible to perform stitching by converting the overlock stitch with the edge of the fabric to the operation. which is made a lockstitch without cutting off the edge of the fabric.

Claims (13)

A sewing machine loop drive mechanism using an upper thread passing through a needle to move up and down a path vertical to the needle plate and a lower thread trapped in a swivel hook, an upper thread passing through the needle for external movement in the vertical direction and passing work stored on the stitch plate at each stitch shift of the work is, at the time of raising the upper thread from the lowest needle position, caught by the tip of the rotary hook 1- '1___ ___ 1 ^ 4 ---- 4 UctUJS.U _of the Axcicur Zrctuny is caught by the third lower thread below the throat plate 3 performs a rotary movement so that the upper-thread and lower thread and intertwined so that it is formed of stitch bonded portion made of a stitch parallel to a flat work and a stitch perpendicular to the work area and the overlying part is formed by an upper looping thread and a lower loop thread that extends through the upper loop, reciprocating along a substantially arcuate path, extending above and below the needle plate and intersecting the needle path above the needle plate and the needle loop respectively; a lower loop moving along a substantially arcuate path beneath the suture plate and intersecting the needle path and the upper loop path, characterized in that the sewing machine drive mechanism further comprises a loop portion of the loop having a structure in which the upper loop and the lower loop respectively; the lower loops are arranged below the suture plate, their respective hook loops are aligned in the same direction such that the loops of the loops pass in front of the needle in the sewing direction, the upper loops and lower loops are driven so that the upper loops and lower loops in planes substantially parallel to each other, the upper looping thread extending through the upper loop executing a reciprocating movement along an arcuate path intersecting the &quot; loop &quot; 99 ···· ► · * • 9 9 9 9 · a · · · · · The needle path above the needle plate and passing through the needle plate is caught by the needle descending from the uppermost position when the upper loop descends from the uppermost position, the lower looping thread passing through the lower loop executing a reciprocating path across the path the needles and the upper loop path under the throat plate is caught by the downward needle below the throat plate as the lower loop moves from one end of the path to the other, and the lower loop is caught by the upper loop rising from the lowest position when the lower loop moves to the other end, wherein the upper looping thread and the lower looping on the edge portion of the looping thread is looped over the looping thread is looped from the work area to form an overlock portion of the stitch. looping threads are each other work and at the same time Yippee upper upper work areas and lower bound parts stitch through bottom Sewing machine drive mechanism according to claim 1, characterized in that the loop part of the loop comprises a crank that is mounted on the loop of the loop driven by the lower drive shaft, a lower loop drive rod coupled to the crank, a lower loop mounting arm for supporting the lower loop. is coupled to the lower looper drive rod and housed in the frame, the upper looper fastening arm for supporting the upper looper, which is housed in the frame, and the upper looper drive rod that connects the lower looper drive rod and the upper looper fastening arm. The sewing machine loop mechanism of claim 2, wherein the loop mechanism comprises a clutch that forms a locked portion of the stitch and an overlock portion of the stitch by transferring power from the lower shaft to the drive shaft. · The loops at the time of forming the overlock portion of the stitch and form the bound part of the stitch by moving the upper loop at the lowest position and interrupting the power transmission from the lower shaft to the loop of the loop at the time the bound part of the stitch is formed. 4. A sewing machine cutter drive mechanism for cutting the edge of the fabric by a top cutter that moves up and down through a movement transfer mechanism that is controlled by a sewing machine rotating shaft and the bottom cutter is ov &apos; puxupi ctc i. with the top of the cutter, characterized in that the cutter drive mechanism of the sewing machine comprises a cutter drive portion which is rotatably mounted on the frame and slidably guides the top cutter, and the movement transmission mechanism is coupled to the top cutter such that which allows the power to be transferred to the upper cutter when the shearing operation is performed by the drive part of the shredder and interrupts the transfer of power to the upper shredder by rotating the shredder drive part to a shifted position where the shearing operation is not carried out. 5. The cutter sewing machine drive mechanism of claim 4, wherein the motion transmission mechanism comprises a first four-crank mechanism that connects the upper shaft forming the rotating shaft and the second four-crank mechanism and the frame link member and adopts the clutch drive portion as another single link. The sewing machine trimmer drive mechanism according to claim 5, wherein the clutch comprises a pin that forms one additional rod as a drive portion and a longitudinal groove formed in the upper clipper to the pin could be mounted in this groove as a drive part. The sewing machine trimmer drive mechanism of claim 4, wherein the lower trimmer is slidably mounted on the trimmer drive portion and the lower trimmer includes a positioning locking portion that positions the trimmer drive portion in the positioning recessed portion of the needle plate when the needle is inserted. the cutter is in operation. The sewing machine trimmer drive mechanism according to claim 7, characterized in that the position of the positioning recessed portion of the throat plate is adjustable to the right and left such that the stitch width can be changed relative to the needle piercing point. The sewing machine cutter drive mechanism according to claim 4, wherein the lower cutter is slidably mounted on the cutter drive portion and the sewing machine cutter drive mechanism further comprises a push cutter which biases the upper cutter. elastic member on the side of the trimmer to the bottom The sewing machine trimmer drive mechanism of claim 4, wherein the lower trimmer is slidably mounted on the trimmer drive portion and the sewing machine drive mechanism further includes a positioning resilient member that biases the positioning locking portion to the positioning recessed portion of the throat plate at the time of operation. trimming. 11. A sewing machine trimmer drive mechanism according to claim 4, wherein the lower trimmer is slidably mounted on the trimmer drive portion, and the trimmer drive mechanism is a and a &quot; and &quot; The sewing machine further comprises a positioning eccentric cam by means of which the positioning locking portion is mounted in the positioning recessed portion of the throat plate at the time of the shearing operation. The sewing machine cutter drive mechanism of claim 4, wherein the top cutter is interchangeably mounted on the drive portion of the cutter. 13. A sewing machine trimmer drive mechanism according to claim 4, wherein the lower trimmer is slidably mounted on the trimmer drive portion and includes a positioning locking portion that positions the trimmer drive portion in the positioning recessed portion of the throat plate relative to the needle stitching position. The trimmer includes a positioning lever by means of which the positioning locking portion is inserted into the positioning recessed portion of the throat plate at the time of the trimming operation.